Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

AGC for tape recorders (CB7337E)
This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent...
Triangular Oscillator (CB17597E)
This circuit uses an operational like to the 741 having been found in a 2001 documentation. The...
Audio alarm timer (CB22063E)
Found in English documentation, this timer produces an audio signal at the end of the timing. The...